We'll talk about the notebook interface in the Cloud and what you can do and build with it. We'll give an overview over the latest advances in Cloud notebook rendering technology, also providing insights in its challenges and how we deal with them. Behind the scenes, it's all about boxes and JavaScript -- but you don't have to be familiar with either of them to appreciate their combination.We'll show how to deploy interactive content and API functions to the Cloud, allowing you to create anything from small tools and widgets to whole web applications powered by Wolfram technologies.